CVE-2026-12259

creationtimestamp| type| source ---|---|--- 2026-09-08 16:35:07+00:00| published-proof-of-concept| https://github.com/advisories/GHSA-5wp5-5229-5g6q 2026-09-08 20:30:04+00:00| seen| https://bsky.app/profile/stackflag.bsky.social/post/3muzugs7i6b24...

annotald (1.3.8), caterpillar (>=1.0.0.dev4, <=1.0.0.dev17) potentially affected by CVE-2026-12259 +1 more via nltk (2.0.5)

nltk PYPI version 2.0.5 is affected by a known vulnerability. The following packages have a transitive dependency on nltk and may be impacted: - annotald 1.3.8 - caterpillar =1.0.0.dev4, =1.0.0.dev17 Source cves: CVE-2026-12259, CVE-2026-63310 Source advisory: OSV:GHSA-5WP5-5229-5G6Q...

aa-rag (>=0.4.2, <=0.4.3), aaa-ml-datasets-course (1.0.0) +799 more potentially affected by CVE-2026-12259 via nltk (>=3.0.0, <=3.9.2)

nltk PYPI version =3.0.0, =0.4.2, =0.2.3, =0.2.0, =0.0.4, =0.0.1, =0.1.0, =0.1.0, =0.0.9, =0.17.0, =0.0.0.dev0, =7.28.2.post5.dev33128883500 and more Source cves: CVE-2026-12259 Source advisory: GHSA-5WP5-5229-5G6Q...

annotald (1.3.8), caterpillar (>=1.0.0.dev4, <=1.0.0.dev17) potentially affected by CVE-2026-12259 +1 more via nltk (2.0.5)

nltk PYPI version 2.0.5 is affected by a known vulnerability. The following packages have a transitive dependency on nltk and may be impacted: - annotald 1.3.8 - caterpillar =1.0.0.dev4, =1.0.0.dev17 Source cves: CVE-2026-12259, CVE-2026-63310 Source advisory: OSV:PYSEC-2026-3729...

aa-rag (>=0.4.2, <=0.4.3), aaa-ml-datasets-course (1.0.0) +799 more potentially affected by CVE-2026-12259 +1 more via nltk (>=3.0.0, <=3.9.2)

nltk PYPI version =3.0.0, =0.4.2, =0.2.3, =0.2.0, =0.0.4, =0.0.1, =0.1.0, =0.1.0, =0.0.9, =0.17.0, =0.0.0.dev0, =7.28.2.post5.dev33128883500 and more Source cves: CVE-2026-12259, CVE-2026-63310 Source advisory: OSV:PYSEC-2026-3729...

CVE-2026-12259

In nltk version 3.9.4, the nltk.downloader.Downloader.downloadpackage function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. This allows an attacker to tamper with the package response body for info.url through a compromised...

CVE-2026-12259 Improper Input Validation in nltk/nltk

In nltk version 3.9.4, the nltk.downloader.Downloader.downloadpackage function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. This allows an attacker to tamper with the package response body for info.url through a compromised...

CVE-2026-12259 Improper Input Validation in nltk/nltk

In nltk version 3.9.4, the nltk.downloader.Downloader.downloadpackage function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. This allows an attacker to tamper with the package response body for info.url through a compromised...