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CVE-2026-26995 Low

uTLS has a fingerprint vulnerability from missing padding extension for Chrome 120

The padding extension was incorrectly removed in utls for the non-pq variant of Chrome 120 fingerprint. Chrome removed this extension only when sending pq keyshares. Only this fingerprint is affected since newer fingerprints have pq keyshares by default and older fingerprints have this extension. Affected symbols: `HelloChrome_120` Fix commit: 8fe0b08e9a0e7e2d08b268f451f2c79962e6acd0 Thanks to telegram @acgdaily for reporting this issue.

Exploit probability Not scored
Published February 18, 2026
Required by Not available
Last source change March 23, 2026

02 / AFFECTED SOFTWARE

Affected packages

Go github.com/refraction-networking/utls
Go github.com/refraction-networking/utls

03 / CONNECTIONS

Connected vulnerabilities

04 / EVIDENCE

Source records

Open Source Vulnerabilities GHSA-rrxv-pmq9-x67r

The padding extension was incorrectly removed in utls for the non-pq variant of Chrome 120 fingerprint. Chrome removed this extension only when sending pq keyshares. Only this fingerprint is affected since newer fingerprints have pq keyshares by default and older fingerprints have this extension. Affected symbols: `HelloChrome_120` Fix commit: 8fe0b08e9a0e7e2d08b268f451f2c79962e6acd0 Thanks to telegram @acgdaily for reporting this issue.

View original source
Open Source Vulnerabilities GO-2026-4512

Fingerprint vulnerability in uTLS from missing padding extension for Chrome 120 in github.com/refraction-networking/utls

View original source

05 / REFERENCES

Further evidence