CVE & CISA-KEV CatalogNVD
CVE-2026-78660
HIGH7.5
CVSS v3
Description
Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing. However, this makes it possible for our HTTP/2 implementation to forward responses containing such headers to an HTTP/1 client when acting as a reverse proxy. If the HTTP/1 client also does not behave strictly enough, this can result in response smuggling.
How to fix
Remediation Available
golang-1.26Debian
Fixed in:1.26.9-1CVE-2026-78660
golang-1.27Debian
Fixed in:1.27.2-1CVE-2026-78660
golang-golang-x-netDebian
Fixed in:1:0.60.0-1CVE-2026-78660
golang.org/x/netGo
Fixed in:0.60.0GO-2026-6610
stdlibGo
Fixed in:1.26.9GO-2026-6610
delve-0:1.26.1Red Hat / RHEL
Fixed in:1.module+el8.6.0+24782+a062e766.src::go-toolset:rhel8RHSA-2026:87246
Fixed in:1.module+el8.10.0+24516+40554724.aarch64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.4.0+25181+7ce5b91c.x86_64::go-toolset:rhel8RHSA-2026:90994
Fixed in:1.module+el8.8.0+24781+86ad105d.x86_64::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.8.0+24781+86ad105d.ppc64le::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+24516+40554724.x86_64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.4.0+25181+7ce5b91c.src::go-toolset:rhel8RHSA-2026:90994
Fixed in:1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8RHSA-2026:86203
delve-0:1.26.1Rocky
Fixed in:1.module+el8.8.0+24781+86ad105d.ppc64le::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+24516+40554724.src::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.6.0+24782+a062e766.x86_64::go-toolset:rhel8RHSA-2026:87246
Fixed in:1.module+el8.4.0+25181+7ce5b91c.src::go-toolset:rhel8RHSA-2026:90994
Fixed in:1.module+el8.8.0+24781+86ad105d.src::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.8.0+24781+86ad105d.x86_64::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.4.0+25181+7ce5b91c.x86_64::go-toolset:rhel8RHSA-2026:90994
Fixed in:1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8RHSA-2026:86203
delve-debuginfo-0:1.26.1Red Hat / RHEL
Fixed in:1.module+el8.4.0+25181+7ce5b91c.x86_64::go-toolset:rhel8RHSA-2026:90994
Fixed in:1.module+el8.10.0+24516+40554724.aarch64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+24516+40554724.x86_64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.6.0+24782+a062e766.x86_64::go-toolset:rhel8RHSA-2026:87246
Fixed in:1.module+el8.8.0+24781+86ad105d.x86_64::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.8.0+24781+86ad105d.ppc64le::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8RHSA-2026:86203
delve-debuginfo-0:1.26.1Rocky
Fixed in:1.module+el8.6.0+24782+a062e766.x86_64::go-toolset:rhel8RHSA-2026:87246
Fixed in:1.module+el8.8.0+24781+86ad105d.ppc64le::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.4.0+25181+7ce5b91c.x86_64::go-toolset:rhel8RHSA-2026:90994
Fixed in:1.module+el8.10.0+24516+40554724.aarch64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+24516+40554724.x86_64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.8.0+24781+86ad105d.x86_64::go-toolset:rhel8RHSA-2026:87245
delve-debugsource-0:1.26.1Red Hat / RHEL
Fixed in:1.module+el8.4.0+25181+7ce5b91c.x86_64::go-toolset:rhel8RHSA-2026:90994
Fixed in:1.module+el8.8.0+24781+86ad105d.x86_64::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+24516+40554724.x86_64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+24516+40554724.aarch64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.8.0+24781+86ad105d.ppc64le::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.6.0+24782+a062e766.x86_64::go-toolset:rhel8RHSA-2026:87246
delve-debugsource-0:1.26.1Rocky
Fixed in:1.module+el8.10.0+24516+40554724.x86_64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.8.0+24781+86ad105d.x86_64::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.6.0+24782+a062e766.x86_64::go-toolset:rhel8RHSA-2026:87246
Fixed in:1.module+el8.10.0+24516+40554724.aarch64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+24516+40554724.ppc64le::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.4.0+25181+7ce5b91c.x86_64::go-toolset:rhel8RHSA-2026:90994
Fixed in:1.module+el8.8.0+24781+86ad105d.ppc64le::go-toolset:rhel8RHSA-2026:87245
go-toolsetRocky
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
go-toolsetRed Hat / RHEL
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
go-toolset-0:1.26.10Rocky
Fixed in:1.module+el8.10.0+25107+6b50279c.aarch64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+25107+6b50279c.s390x::go-toolset:rhel8RHSA-2026:86203
Fixed in:2.module+el8.4.0+25201+9a419e96.x86_64::go-toolset:rhel8RHSA-2026:90994
Fixed in:4.module+el8.8.0+25113+a148ecc0.x86_64::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+25107+6b50279c.x86_64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+25107+6b50279c.ppc64le::go-toolset:rhel8RHSA-2026:86203
Fixed in:4.module+el8.8.0+25113+a148ecc0.ppc64le::go-toolset:rhel8RHSA-2026:87245
Fixed in:4.module+el8.6.0+25114+90ecdb41.x86_64::go-toolset:rhel8RHSA-2026:87246
go-toolset-0:1.26.10Red Hat / RHEL
Fixed in:2.module+el8.4.0+25201+9a419e96.x86_64::go-toolset:rhel8RHSA-2026:90994
Fixed in:4.module+el8.8.0+25113+a148ecc0.ppc64le::go-toolset:rhel8RHSA-2026:87245
Fixed in:4.module+el8.6.0+25114+90ecdb41.x86_64::go-toolset:rhel8RHSA-2026:87246
Fixed in:4.module+el8.8.0+25113+a148ecc0.x86_64::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+25107+6b50279c.x86_64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+25107+6b50279c.ppc64le::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+25107+6b50279c.aarch64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+25107+6b50279c.s390x::go-toolset:rhel8RHSA-2026:86203
golangRed Hat / RHEL
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
golangRocky
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
golang-0:1.26.10Red Hat / RHEL
Fixed in:4.module+el8.6.0+25114+90ecdb41.src::go-toolset:rhel8RHSA-2026:87246
Fixed in:1.module+el8.10.0+25107+6b50279c.src::go-toolset:rhel8RHSA-2026:86203
Fixed in:4.module+el8.8.0+25113+a148ecc0.src::go-toolset:rhel8RHSA-2026:87245
Fixed in:4.module+el8.8.0+25113+a148ecc0.ppc64le::go-toolset:rhel8RHSA-2026:87245
Fixed in:2.module+el8.4.0+25201+9a419e96.x86_64::go-toolset:rhel8RHSA-2026:90994
Fixed in:4.module+el8.8.0+25113+a148ecc0.x86_64::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+25107+6b50279c.s390x::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+25107+6b50279c.x86_64::go-toolset:rhel8RHSA-2026:86203
golang-0:1.26.10Rocky
Fixed in:4.module+el8.6.0+25114+90ecdb41.src::go-toolset:rhel8RHSA-2026:87246
Fixed in:2.module+el8.4.0+25201+9a419e96.x86_64::go-toolset:rhel8RHSA-2026:90994
Fixed in:2.module+el8.4.0+25201+9a419e96.src::go-toolset:rhel8RHSA-2026:90994
Fixed in:4.module+el8.8.0+25113+a148ecc0.src::go-toolset:rhel8RHSA-2026:87245
Fixed in:4.module+el8.8.0+25113+a148ecc0.x86_64::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+25107+6b50279c.aarch64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+25107+6b50279c.src::go-toolset:rhel8RHSA-2026:86203
Fixed in:4.module+el8.8.0+25113+a148ecc0.ppc64le::go-toolset:rhel8RHSA-2026:87245
golang-binRed Hat / RHEL
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
golang-binRocky
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
golang-bin-0:1.26.10Red Hat / RHEL
Fixed in:2.module+el8.4.0+25201+9a419e96.x86_64::go-toolset:rhel8RHSA-2026:90994
Fixed in:1.module+el8.10.0+25107+6b50279c.aarch64::go-toolset:rhel8RHSA-2026:86203
Fixed in:4.module+el8.6.0+25114+90ecdb41.x86_64::go-toolset:rhel8RHSA-2026:87246
Fixed in:1.module+el8.10.0+25107+6b50279c.s390x::go-toolset:rhel8RHSA-2026:86203
Fixed in:4.module+el8.8.0+25113+a148ecc0.x86_64::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+25107+6b50279c.ppc64le::go-toolset:rhel8RHSA-2026:86203
Fixed in:4.module+el8.8.0+25113+a148ecc0.ppc64le::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+25107+6b50279c.x86_64::go-toolset:rhel8RHSA-2026:86203
golang-bin-0:1.26.10Rocky
Fixed in:1.module+el8.10.0+25107+6b50279c.x86_64::go-toolset:rhel8RHSA-2026:86203
Fixed in:1.module+el8.10.0+25107+6b50279c.aarch64::go-toolset:rhel8RHSA-2026:86203
Fixed in:4.module+el8.6.0+25114+90ecdb41.x86_64::go-toolset:rhel8RHSA-2026:87246
Fixed in:4.module+el8.8.0+25113+a148ecc0.ppc64le::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+25107+6b50279c.s390x::go-toolset:rhel8RHSA-2026:86203
Fixed in:4.module+el8.8.0+25113+a148ecc0.x86_64::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+25107+6b50279c.ppc64le::go-toolset:rhel8RHSA-2026:86203
Fixed in:2.module+el8.4.0+25201+9a419e96.x86_64::go-toolset:rhel8RHSA-2026:90994
golang-docsRed Hat / RHEL
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el9_2RHSA-2026:87041
Fixed in:0:1.26.10-1.el9_8RHSA-2026:86196
Fixed in:0:1.26.10-1.el9_6RHSA-2026:87043
Fixed in:0:1.26.10-1.el9_4RHSA-2026:87042
golang-docsRocky
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el9_4RHSA-2026:87042
Fixed in:0:1.26.10-1.el9_6RHSA-2026:87043
Fixed in:0:1.26.10-1.el9_8RHSA-2026:86196
Fixed in:0:1.26.10-1.el9_2RHSA-2026:87041
golang-docs-0:1.26.10Red Hat / RHEL
Fixed in:4.module+el8.8.0+25113+a148ecc0.noarch::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+25107+6b50279c.noarch::go-toolset:rhel8RHSA-2026:86203
Fixed in:4.module+el8.6.0+25114+90ecdb41.noarch::go-toolset:rhel8RHSA-2026:87246
Fixed in:2.module+el8.4.0+25201+9a419e96.noarch::go-toolset:rhel8RHSA-2026:90994
golang-docs-0:1.26.10Rocky
Fixed in:4.module+el8.8.0+25113+a148ecc0.noarch::go-toolset:rhel8RHSA-2026:87245
Fixed in:4.module+el8.6.0+25114+90ecdb41.noarch::go-toolset:rhel8RHSA-2026:87246
Fixed in:1.module+el8.10.0+25107+6b50279c.noarch::go-toolset:rhel8RHSA-2026:86203
Fixed in:2.module+el8.4.0+25201+9a419e96.noarch::go-toolset:rhel8RHSA-2026:90994
golang-miscRed Hat / RHEL
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el9_4RHSA-2026:87042
Fixed in:0:1.26.10-1.el9_2RHSA-2026:87041
Fixed in:0:1.26.10-1.el9_6RHSA-2026:87043
Fixed in:0:1.26.10-1.el9_8RHSA-2026:86196
golang-miscRocky
Fixed in:0:1.26.10-1.el10_0RHSA-2026:87040
Fixed in:0:1.26.10-1.el10_2RHSA-2026:86093
Fixed in:0:1.26.10-1.el9_8RHSA-2026:86196
Fixed in:0:1.26.10-1.el9_2RHSA-2026:87041
Fixed in:0:1.26.10-1.el9_4RHSA-2026:87042
Fixed in:0:1.26.10-1.el9_6RHSA-2026:87043
golang-misc-0:1.26.10Rocky
Fixed in:4.module+el8.6.0+25114+90ecdb41.noarch::go-toolset:rhel8RHSA-2026:87246
Fixed in:4.module+el8.8.0+25113+a148ecc0.noarch::go-toolset:rhel8RHSA-2026:87245
Fixed in:1.module+el8.10.0+25107+6b50279c.noarch::go-toolset:rhel8RHSA-2026:86203
Fixed in:2.module+el8.4.0+25201+9a419e96.noarch::go-toolset:rhel8RHSA-2026:90994
This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Exploit Intelligence
0.43%probability of exploitation in 30 days
37thpercentile
Low risk: more likely to be exploited than 37% of all known CVEs.
References
Other references5
Related Vulnerabilities
Other CWE-444 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2022-22536 | Critical | 10.0 | 98% | KEV | - |
| CVE-2025-61884 | High | 7.5 | 96% | KEV + Ransom | - |
| CVE-2020-9490 | High | 7.5 | 89% | - | Fix |
| CVE-2023-41265 | Critical | 9.6 | 88% | KEV + Ransom | - |
| CVE-2023-25690 | Critical | 9.8 | 85% | - | Fix |
| CVE-2022-32214 | Medium | 6.5 | 82% | - | Fix |
Common questions
How do I fix CVE-2026-78660?
Published advisories record a fix for 46 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2026-78660 being actively exploited?
Not that we know of. CVE-2026-78660 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.43% is the estimated probability that it will be exploited in the next 30 days. That is higher than 37% of all scored CVEs.
How severe is CVE-2026-78660?
CVE-2026-78660 has a CVSS v3 base score of 7.5, rated important. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-78660 affect?
Published advisories record a fix for golang-1.26 (Debian), golang-1.27 (Debian), golang-golang-x-net (Debian), golang.org/x/net (Go), and 42 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-78660
Markdown
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<a href="https://tridentstack.com/cve/CVE-2026-78660"><img src="https://tridentstack.com/cve/badge/CVE-2026-78660.svg" alt="CVE-2026-78660"></a>Check your Linux endpoints for this class of vulnerability
TridentStack Control continuously scans Linux endpoints for known vulnerabilities and deploys the fixes from the same console. 200 endpoints free forever, no credit card.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-09.