Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Dulwich versions before 1.2.9 are vulnerable to a denial of service in the Pack.resolve_object method, which handles packfile object resolution. A malicious packfile containing an OFS_DELTA object with a delta offset of zero causes the resolver to recurse infinitely, consuming CPU until the process crashes. An attacker needs only to get a crafted packfile processed by an operation such as clone, fetch or cat-file. Upgrade to Dulwich 1.2.9 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.1 | High | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | CNA (VulnCheck) |
- CISA KEV Not listed.
- EPSS 0.0031, the 24th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:08 UTC First seen by agentprime
- 31 Oct 2026, 14:08 UTC Confirmed by OSV