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chore(deps): update module github.com/klauspost/compress to v1.18.7 [security] (main) - #151
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This PR contains the following updates:
v1.18.5→v1.18.7Compress/s2: Integer Overflow or Wraparound and Out-of-bounds Write in compress
CVE-2026-63209 / GHSA-259r-337f-4rfw / GO-2026-5841
More information
Details
Signed Integer Overflow in s2.NewDict
Summary
A signed integer overflow vulnerability in
s2.NewDict()allows an attacker to bypass repeat index validation by supplying a dictionary with a uvarint-encoded repeat value exceedingMaxInt64. WhenDict.Encode()is subsequently called, the overflowed negative repeat value causes an out-of-bounds memory access viaunsafe.Pointerarithmetic, crashing the process with SIGSEGV.Package
github.com/klauspost/compress/s2NewDictfunction)Severity
High (7.5) — CVSS v3.1:
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HVulnerability
Type
Description
The
NewDict()function reads a uvarint from dictionary data and converts it toint:When
rexceedsMaxInt64(9223372036854775807),int(r)overflows to a negative value. Since a negative number is never greater than a positive length, the validation check is bypassed.When
Dict.Encode()is called, the negativerepeatvalue causes an integer overflow inencodeBlockDictGo():load32callsle.Load32which usesunsafe.Pointerarithmetic without bounds checking:This causes a segmentation fault (SIGSEGV) when the negative index is dereferenced.
PoC
Impact
Attack Vector
Any application that:
s2.NewDict()Dict.Encode()on any data ≥32 bytesSuggested Fix
Validate the uvarint value before converting to int:
Or use
uintfor the repeat field and validate againstuint(len(dict)).References
s2/dict.golines 59-61 (vulnerability),s2/encode_all.goline 947 (crash site)Credits
Christopher Linke / https://github.com/celinke97/
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
OOB read in github.com/klauspost/compress/s2
CVE-2026-63209 / GHSA-259r-337f-4rfw / GO-2026-5841
More information
Details
Providing a specially crafted dictionary to s2.NewDict and using it to encode data can make the encoder read out of bounds.
Severity
Unknown
References
This data is provided by OSV and the Go Vulnerability Database (CC-BY 4.0).
Release Notes
klauspost/compress (github.com/klauspost/compress)
v1.18.7Compare Source
Security release without other changes.
Full Changelog: klauspost/compress@v1.18.6...v1.18.7
v1.18.6Compare Source
What's Changed
New Contributors
Full Changelog: klauspost/compress@v1.18.5...v1.18.6
Configuration
📅 Schedule: (UTC)
🚦 Automerge: Enabled.
♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
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