CVE-2018-8098 — Integer overflow in the index

Integer overflow in the index.c:read_entry() function while decompressing a compressed prefix length in libgit2 before v0.26.2 allows an attacker to cause a denial of service (out-of-bounds read) via a crafted repository index file.

01What is this vulnerability?

Integer overflow in the index.c:read_entry() function while decompressing a compressed prefix length in libgit2 before v0.26.2 allows an attacker to cause a denial of service (out-of-bounds read) via a crafted repository index file.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2018-03-14T00:00:00.000Z
• Last modified: 2024-08-05T06:46:13.414Z

09References

• github.com — https://github.com/libgit2/libgit2/commit/3207ddb0103543da8ad2139ec6539f590f9900…
• libgit2.github.com — https://libgit2.github.com/security/
• github.com — https://github.com/libgit2/libgit2/commit/3db1af1f370295ad5355b8f64b865a2a357bca…
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2022/03/msg00031.html