CVE-2026-3276Disclosure

LOWCVSS 6.3 · MEDIUM

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft
Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

unicodedata.normalize() can take excessive CPU time when processing specially crafted Unicode input containing long runs of combining characters with alternating Canonical Combining Class values. This affects all normalization forms.

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1.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-407

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

NONE

Threat summary

Public PoC is present in monitored signal
1 mentions across 1 observed day

What's happening

PoC mentioned or linked in 1 signal
Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets2 URLs

By indicator

Full discourse1 post

Open Source Security mailing list@oss_security137d
Disclosure
CVE-2026-3276: CPython: Potential DoS via quadratic complexity in unicodedata.normalize() https://www.openwall.com/lists/oss-security/2026/06/03/15 CVE-2026-7774: CPython: tarfile.⁠data_filter path traversal bypass allows writing outside the extraction directory https://www.openwall.com/lists/oss-security/2026/06/04/9
Post summary
Two new CPython vulnerabilities are disclosed: CVE-2026-3276 causes a DoS via quadratic complexity in unicodedata.normalize(), while CVE-2026-7774 allows path‑traversal during tarfile extraction; no exploits, patches, or active attacks are reported.
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