High
tarfile opened in streaming mode mishandles EOF
Type: advisorySources: OSV
When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-11972
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 16:40 UTC · Revision 1
Source evidence
tarfile opened in streaming mode mishandles EOF
core-osv · Original sourcePublished 23 Jun 2026, 22:02 UTC
When using the "tarfile" module with a file opened in "streaming mode" (mode="r|") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer.
osv:CVE-2026-11972
Complete source record
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"url": "https://osv.dev/vulnerability/CVE-2026-11972",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "tarfile opened in streaming mode mishandles EOF",
"summary": "When using the \"tarfile\" module with a file opened in \"streaming mode\" (mode=\"r|\") the tarfile module did not properly handle EOF, making archive parsing take exponentially longer.",
"evidence": "osv:CVE-2026-11972",
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"CVE-2026-11972",
"PSF-2026-31"
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"modified": "2026-10-28T02:30:37.378513155Z",
"provider": "osv",
"references": [
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"https://mail.python.org/archives/list/security-announce@python.org/thread/AXPSKKTSRKXTTJULW3XSIC74WZNAAPPB/",
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